Henry E. Allison’s scientific contributions

... 6 This passage suggests that Hegel reads into Kant a subjective idealism that shares with empiricism the assumption that the form, as a priori as it may be, is an empty cabinet unless the content of sensory experience fills it from without, a posteriori. However, advances in the debate on the status of Kant's transcendental idealism (Allison 1996) have convincingly shown that this conflation of transcendental idealism and subjective or psychological idealism is highly questionable. 7 Kant's a priori synthesis is not the external combination of an empty form and a raw material, but an active form-content, 8 and it is not a matter of psychology, but rather of logic. ...

Reference:

Hegel's A Priori and the Critique of Three Aprioristic Readings of the Science of Logic